He did it on his own and he recently threatened London so Russia’s in danger as well as Putin because The West will respond with overwhelming force against Russian territory 
Bye bye St. Basil’s?
which of course includes Moscow, St. Petersburg aka Leningrad, Novosibirsk, Kazan, Nizhny Novogorod, The Crimea which he invaded and occupied as well as all other Russian cities, towns scattered across and up and down including Vladivostok, Yekaterinburg, Chelyabinsk, Samara, all of which are susceptible to drone attacks as well as by Intercontinental Missiles. These cities are scattered across hundreds of thousands of square miles of Russia and they are virtually undefendable. Crazy Putin, Power-Mad Putin put all that and all those millions of people in danger. 
Destruction in Mariupol
As he threatened others, he put himself in danger. Perhaps he doesn’t care but the millions of Russians he put in danger care so he better watch his step from danger by his own people as well as from the esponse by the West.
Norwegian troops (above) arrive to reinforce NATO Enhanced Forward Presence in Kaunas, Lithuania, on 27 February 2022. © Reuters
Russia is a big place with millions of people. NATO is bigger with more people and greater Military Strength and Reach.
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